// -----------------------------------------------------------------------
//  <copyright file="PasswordBoxHelper.cs" company="OSharp开源团队">
//      Copyright (c) 2014-2019 OSharp. All rights reserved.
//  </copyright>
//  <site>http://www.osharp.org</site>
//  <last-editor>郭明锋</last-editor>
//  <last-date>2019-10-27 17:44</last-date>
// -----------------------------------------------------------------------

namespace OSharp.Wpf.Xaml;

/// <summary>
/// 为PasswordBox控件的Password增加绑定功能
/// </summary>
public static class PasswordBoxHelper
{
    public static readonly DependencyProperty PasswordProperty =
        DependencyProperty.RegisterAttached("Password",
            typeof(string),
            typeof(PasswordBoxHelper),
            new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged));
    public static readonly DependencyProperty AttachProperty =
        DependencyProperty.RegisterAttached("Attach",
            typeof(bool),
            typeof(PasswordBoxHelper),
            new PropertyMetadata(false, Attach));
    private static readonly DependencyProperty IsUpdatingProperty =
        DependencyProperty.RegisterAttached("IsUpdating",
            typeof(bool),
            typeof(PasswordBoxHelper));

    public static void SetAttach(DependencyObject dp, bool value)
    {
        dp.SetValue(AttachProperty, value);
    }

    public static bool GetAttach(DependencyObject dp)
    {
        return (bool)dp.GetValue(AttachProperty);
    }

    public static string GetPassword(DependencyObject dp)
    {
        return (string)dp.GetValue(PasswordProperty);
    }

    public static void SetPassword(DependencyObject dp, string value)
    {
        dp.SetValue(PasswordProperty, value);
    }

    private static bool GetIsUpdating(DependencyObject dp)
    {
        return (bool)dp.GetValue(IsUpdatingProperty);
    }

    private static void SetIsUpdating(DependencyObject dp, bool value)
    {
        dp.SetValue(IsUpdatingProperty, value);
    }

    private static void OnPasswordPropertyChanged(DependencyObject sender,
        DependencyPropertyChangedEventArgs e)
    {
        PasswordBox passwordBox = (PasswordBox)sender;
        passwordBox.PasswordChanged -= PasswordChanged;
        if (!GetIsUpdating(passwordBox))
        {
            passwordBox.Password = (string)e.NewValue;
        }

        passwordBox.PasswordChanged += PasswordChanged;
    }

    private static void Attach(DependencyObject sender,
        DependencyPropertyChangedEventArgs e)
    {
        PasswordBox passwordBox = sender as PasswordBox;
        if (passwordBox == null)
        {
            return;
        }

        if ((bool)e.OldValue)
        {
            passwordBox.PasswordChanged -= PasswordChanged;
        }

        if ((bool)e.NewValue)
        {
            passwordBox.PasswordChanged += PasswordChanged;
        }
    }

    private static void PasswordChanged(object sender, RoutedEventArgs e)
    {
        PasswordBox passwordBox = (PasswordBox)sender;
        SetIsUpdating(passwordBox, true);
        SetPassword(passwordBox, passwordBox.Password);
        SetIsUpdating(passwordBox, false);
    }
}
